The process you have started will be all lost and you will have to start from the beginning. For a spouse visa to be processed abroad, it will be about 6-12 months. In the meantime, she will probably not be permitted to enter the US as a visitor. However, as part of the process you submitted, you probably also filed an application for a travel document known as advance parole. That usually comes about 2-3 months after filing. With that document, she will be able to travel internationally without abandoning the permanent residence process, while it is waiting for the interview.
Answered on Jul 15th, 2013 at 8:58 PM